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CellTable sorting : sorting several columns ?

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Google Web Toolkit Eclipse IDE Java
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I am using GWT 2.2 and the new CellTable sorting features, as described here :

There is a strange error (Umbrella exception, nothing else) when I use the columnSortHandler.setComparator(...) method.
I commented it out.

If i use the addColumnSortHandler(new ColumnSortEvent.Handler() { ...} method, it works.

However on one column only. I want to be able to sort the table, on whichever column i click on.

So i'm stuck :
either i figure out what's wrong with the setComparator(..) method
or i use the addColumnSortHandler(...) and in that case i need to figure out how to retrieve the name of the column
that is currently sorted.
Does anyone know what could be wrong ?

Here is the code :

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